/*
 * A JavaScript implementation of the RSA Data Security, Inc. MD5 Message
 * Digest Algorithm, as defined in RFC 1321.
 * Version 2.2 Copyright (C) Paul Johnston 1999 - 2009
 * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
 * Distributed under the BSD License
 * See http://pajhome.org.uk/crypt/md5 for more info.
 */

/*
 * Configurable variables. You may need to tweak these to be compatible with
 * the server-side, but the defaults work in most cases.
 */

function MD5(instring){
	var hexcase = 0;   /* hex output format. 0 - lowercase; 1 - uppercase        */
	var b64pad  = "";  /* base-64 pad character. "=" for strict RFC compliance   */

	/*
	 * These are the functions you'll usually want to call
	 * They take string arguments and return either hex or base-64 encoded strings
	 */
	function hex_md5(s)    { return rstr2hex(rstr_md5(str2rstr_utf8(s))); }
	function b64_md5(s)    { return rstr2b64(rstr_md5(str2rstr_utf8(s))); }
	function any_md5(s, e) { return rstr2any(rstr_md5(str2rstr_utf8(s)), e); }
	function hex_hmac_md5(k, d)
	  { return rstr2hex(rstr_hmac_md5(str2rstr_utf8(k), str2rstr_utf8(d))); }
	function b64_hmac_md5(k, d)
	  { return rstr2b64(rstr_hmac_md5(str2rstr_utf8(k), str2rstr_utf8(d))); }
	function any_hmac_md5(k, d, e)
	  { return rstr2any(rstr_hmac_md5(str2rstr_utf8(k), str2rstr_utf8(d)), e); }

	/*
	 * Perform a simple self-test to see if the VM is working
	 */
	function md5_vm_test()
	{
	  return hex_md5("abc").toLowerCase() == "900150983cd24fb0d6963f7d28e17f72";
	}

	/*
	 * Calculate the MD5 of a raw string
	 */
	function rstr_md5(s)
	{
	  return binl2rstr(binl_md5(rstr2binl(s), s.length * 8));
	}

	/*
	 * Calculate the HMAC-MD5, of a key and some data (raw strings)
	 */
	function rstr_hmac_md5(key, data)
	{
	  var bkey = rstr2binl(key);
	  if(bkey.length > 16) bkey = binl_md5(bkey, key.length * 8);

	  var ipad = Array(16), opad = Array(16);
	  for(var i = 0; i < 16; i++)
	  {
	    ipad[i] = bkey[i] ^ 0x36363636;
	    opad[i] = bkey[i] ^ 0x5C5C5C5C;
	  }

	  var hash = binl_md5(ipad.concat(rstr2binl(data)), 512 + data.length * 8);
	  return binl2rstr(binl_md5(opad.concat(hash), 512 + 128));
	}

	/*
	 * Convert a raw string to a hex string
	 */
	function rstr2hex(input)
	{
	  try { hexcase } catch(e) { hexcase=0; }
	  var hex_tab = hexcase ? "0123456789ABCDEF" : "0123456789abcdef";
	  var output = "";
	  var x;
	  for(var i = 0; i < input.length; i++)
	  {
	    x = input.charCodeAt(i);
	    output += hex_tab.charAt((x >>> 4) & 0x0F)
	           +  hex_tab.charAt( x        & 0x0F);
	  }
	  return output;
	}

	/*
	 * Convert a raw string to a base-64 string
	 */
	function rstr2b64(input)
	{
	  try { b64pad } catch(e) { b64pad=''; }
	  var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
	  var output = "";
	  var len = input.length;
	  for(var i = 0; i < len; i += 3)
	  {
	    var triplet = (input.charCodeAt(i) << 16)
	                | (i + 1 < len ? input.charCodeAt(i+1) << 8 : 0)
	                | (i + 2 < len ? input.charCodeAt(i+2)      : 0);
	    for(var j = 0; j < 4; j++)
	    {
	      if(i * 8 + j * 6 > input.length * 8) output += b64pad;
	      else output += tab.charAt((triplet >>> 6*(3-j)) & 0x3F);
	    }
	  }
	  return output;
	}

	/*
	 * Convert a raw string to an arbitrary string encoding
	 */
	function rstr2any(input, encoding)
	{
	  var divisor = encoding.length;
	  var i, j, q, x, quotient;

	  /* Convert to an array of 16-bit big-endian values, forming the dividend */
	  var dividend = Array(Math.ceil(input.length / 2));
	  for(i = 0; i < dividend.length; i++)
	  {
	    dividend[i] = (input.charCodeAt(i * 2) << 8) | input.charCodeAt(i * 2 + 1);
	  }

	  /*
	   * Repeatedly perform a long division. The binary array forms the dividend,
	   * the length of the encoding is the divisor. Once computed, the quotient
	   * forms the dividend for the next step. All remainders are stored for later
	   * use.
	   */
	  var full_length = Math.ceil(input.length * 8 /
	                                    (Math.log(encoding.length) / Math.log(2)));
	  var remainders = Array(full_length);
	  for(j = 0; j < full_length; j++)
	  {
	    quotient = Array();
	    x = 0;
	    for(i = 0; i < dividend.length; i++)
	    {
	      x = (x << 16) + dividend[i];
	      q = Math.floor(x / divisor);
	      x -= q * divisor;
	      if(quotient.length > 0 || q > 0)
	        quotient[quotient.length] = q;
	    }
	    remainders[j] = x;
	    dividend = quotient;
	  }

	  /* Convert the remainders to the output string */
	  var output = "";
	  for(i = remainders.length - 1; i >= 0; i--)
	    output += encoding.charAt(remainders[i]);

	  return output;
	}

	/*
	 * Encode a string as utf-8.
	 * For efficiency, this assumes the input is valid utf-16.
	 */
	function str2rstr_utf8(input)
	{
	  var output = "";
	  var i = -1;
	  var x, y;

	  while(++i < input.length)
	  {
	    /* Decode utf-16 surrogate pairs */
	    x = input.charCodeAt(i);
	    y = i + 1 < input.length ? input.charCodeAt(i + 1) : 0;
	    if(0xD800 <= x && x <= 0xDBFF && 0xDC00 <= y && y <= 0xDFFF)
	    {
	      x = 0x10000 + ((x & 0x03FF) << 10) + (y & 0x03FF);
	      i++;
	    }

	    /* Encode output as utf-8 */
	    if(x <= 0x7F)
	      output += String.fromCharCode(x);
	    else if(x <= 0x7FF)
	      output += String.fromCharCode(0xC0 | ((x >>> 6 ) & 0x1F),
	                                    0x80 | ( x         & 0x3F));
	    else if(x <= 0xFFFF)
	      output += String.fromCharCode(0xE0 | ((x >>> 12) & 0x0F),
	                                    0x80 | ((x >>> 6 ) & 0x3F),
	                                    0x80 | ( x         & 0x3F));
	    else if(x <= 0x1FFFFF)
	      output += String.fromCharCode(0xF0 | ((x >>> 18) & 0x07),
	                                    0x80 | ((x >>> 12) & 0x3F),
	                                    0x80 | ((x >>> 6 ) & 0x3F),
	                                    0x80 | ( x         & 0x3F));
	  }
	  return output;
	}

	/*
	 * Encode a string as utf-16
	 */
	function str2rstr_utf16le(input)
	{
	  var output = "";
	  for(var i = 0; i < input.length; i++)
	    output += String.fromCharCode( input.charCodeAt(i)        & 0xFF,
	                                  (input.charCodeAt(i) >>> 8) & 0xFF);
	  return output;
	}

	function str2rstr_utf16be(input)
	{
	  var output = "";
	  for(var i = 0; i < input.length; i++)
	    output += String.fromCharCode((input.charCodeAt(i) >>> 8) & 0xFF,
	                                   input.charCodeAt(i)        & 0xFF);
	  return output;
	}

	/*
	 * Convert a raw string to an array of little-endian words
	 * Characters >255 have their high-byte silently ignored.
	 */
	function rstr2binl(input)
	{
	  var output = Array(input.length >> 2);
	  for(var i = 0; i < output.length; i++)
	    output[i] = 0;
	  for(var i = 0; i < input.length * 8; i += 8)
	    output[i>>5] |= (input.charCodeAt(i / 8) & 0xFF) << (i%32);
	  return output;
	}

	/*
	 * Convert an array of little-endian words to a string
	 */
	function binl2rstr(input)
	{
	  var output = "";
	  for(var i = 0; i < input.length * 32; i += 8)
	    output += String.fromCharCode((input[i>>5] >>> (i % 32)) & 0xFF);
	  return output;
	}

	/*
	 * Calculate the MD5 of an array of little-endian words, and a bit length.
	 */
	function binl_md5(x, len)
	{
	  /* append padding */
	  x[len >> 5] |= 0x80 << ((len) % 32);
	  x[(((len + 64) >>> 9) << 4) + 14] = len;

	  var a =  1732584193;
	  var b = -271733879;
	  var c = -1732584194;
	  var d =  271733878;

	  for(var i = 0; i < x.length; i += 16)
	  {
	    var olda = a;
	    var oldb = b;
	    var oldc = c;
	    var oldd = d;

	    a = md5_ff(a, b, c, d, x[i+ 0], 7 , -680876936);
	    d = md5_ff(d, a, b, c, x[i+ 1], 12, -389564586);
	    c = md5_ff(c, d, a, b, x[i+ 2], 17,  606105819);
	    b = md5_ff(b, c, d, a, x[i+ 3], 22, -1044525330);
	    a = md5_ff(a, b, c, d, x[i+ 4], 7 , -176418897);
	    d = md5_ff(d, a, b, c, x[i+ 5], 12,  1200080426);
	    c = md5_ff(c, d, a, b, x[i+ 6], 17, -1473231341);
	    b = md5_ff(b, c, d, a, x[i+ 7], 22, -45705983);
	    a = md5_ff(a, b, c, d, x[i+ 8], 7 ,  1770035416);
	    d = md5_ff(d, a, b, c, x[i+ 9], 12, -1958414417);
	    c = md5_ff(c, d, a, b, x[i+10], 17, -42063);
	    b = md5_ff(b, c, d, a, x[i+11], 22, -1990404162);
	    a = md5_ff(a, b, c, d, x[i+12], 7 ,  1804603682);
	    d = md5_ff(d, a, b, c, x[i+13], 12, -40341101);
	    c = md5_ff(c, d, a, b, x[i+14], 17, -1502002290);
	    b = md5_ff(b, c, d, a, x[i+15], 22,  1236535329);

	    a = md5_gg(a, b, c, d, x[i+ 1], 5 , -165796510);
	    d = md5_gg(d, a, b, c, x[i+ 6], 9 , -1069501632);
	    c = md5_gg(c, d, a, b, x[i+11], 14,  643717713);
	    b = md5_gg(b, c, d, a, x[i+ 0], 20, -373897302);
	    a = md5_gg(a, b, c, d, x[i+ 5], 5 , -701558691);
	    d = md5_gg(d, a, b, c, x[i+10], 9 ,  38016083);
	    c = md5_gg(c, d, a, b, x[i+15], 14, -660478335);
	    b = md5_gg(b, c, d, a, x[i+ 4], 20, -405537848);
	    a = md5_gg(a, b, c, d, x[i+ 9], 5 ,  568446438);
	    d = md5_gg(d, a, b, c, x[i+14], 9 , -1019803690);
	    c = md5_gg(c, d, a, b, x[i+ 3], 14, -187363961);
	    b = md5_gg(b, c, d, a, x[i+ 8], 20,  1163531501);
	    a = md5_gg(a, b, c, d, x[i+13], 5 , -1444681467);
	    d = md5_gg(d, a, b, c, x[i+ 2], 9 , -51403784);
	    c = md5_gg(c, d, a, b, x[i+ 7], 14,  1735328473);
	    b = md5_gg(b, c, d, a, x[i+12], 20, -1926607734);

	    a = md5_hh(a, b, c, d, x[i+ 5], 4 , -378558);
	    d = md5_hh(d, a, b, c, x[i+ 8], 11, -2022574463);
	    c = md5_hh(c, d, a, b, x[i+11], 16,  1839030562);
	    b = md5_hh(b, c, d, a, x[i+14], 23, -35309556);
	    a = md5_hh(a, b, c, d, x[i+ 1], 4 , -1530992060);
	    d = md5_hh(d, a, b, c, x[i+ 4], 11,  1272893353);
	    c = md5_hh(c, d, a, b, x[i+ 7], 16, -155497632);
	    b = md5_hh(b, c, d, a, x[i+10], 23, -1094730640);
	    a = md5_hh(a, b, c, d, x[i+13], 4 ,  681279174);
	    d = md5_hh(d, a, b, c, x[i+ 0], 11, -358537222);
	    c = md5_hh(c, d, a, b, x[i+ 3], 16, -722521979);
	    b = md5_hh(b, c, d, a, x[i+ 6], 23,  76029189);
	    a = md5_hh(a, b, c, d, x[i+ 9], 4 , -640364487);
	    d = md5_hh(d, a, b, c, x[i+12], 11, -421815835);
	    c = md5_hh(c, d, a, b, x[i+15], 16,  530742520);
	    b = md5_hh(b, c, d, a, x[i+ 2], 23, -995338651);

	    a = md5_ii(a, b, c, d, x[i+ 0], 6 , -198630844);
	    d = md5_ii(d, a, b, c, x[i+ 7], 10,  1126891415);
	    c = md5_ii(c, d, a, b, x[i+14], 15, -1416354905);
	    b = md5_ii(b, c, d, a, x[i+ 5], 21, -57434055);
	    a = md5_ii(a, b, c, d, x[i+12], 6 ,  1700485571);
	    d = md5_ii(d, a, b, c, x[i+ 3], 10, -1894986606);
	    c = md5_ii(c, d, a, b, x[i+10], 15, -1051523);
	    b = md5_ii(b, c, d, a, x[i+ 1], 21, -2054922799);
	    a = md5_ii(a, b, c, d, x[i+ 8], 6 ,  1873313359);
	    d = md5_ii(d, a, b, c, x[i+15], 10, -30611744);
	    c = md5_ii(c, d, a, b, x[i+ 6], 15, -1560198380);
	    b = md5_ii(b, c, d, a, x[i+13], 21,  1309151649);
	    a = md5_ii(a, b, c, d, x[i+ 4], 6 , -145523070);
	    d = md5_ii(d, a, b, c, x[i+11], 10, -1120210379);
	    c = md5_ii(c, d, a, b, x[i+ 2], 15,  718787259);
	    b = md5_ii(b, c, d, a, x[i+ 9], 21, -343485551);

	    a = safe_add(a, olda);
	    b = safe_add(b, oldb);
	    c = safe_add(c, oldc);
	    d = safe_add(d, oldd);
	  }
	  return Array(a, b, c, d);
	}

	/*
	 * These functions implement the four basic operations the algorithm uses.
	 */
	function md5_cmn(q, a, b, x, s, t)
	{
	  return safe_add(bit_rol(safe_add(safe_add(a, q), safe_add(x, t)), s),b);
	}
	function md5_ff(a, b, c, d, x, s, t)
	{
	  return md5_cmn((b & c) | ((~b) & d), a, b, x, s, t);
	}
	function md5_gg(a, b, c, d, x, s, t)
	{
	  return md5_cmn((b & d) | (c & (~d)), a, b, x, s, t);
	}
	function md5_hh(a, b, c, d, x, s, t)
	{
	  return md5_cmn(b ^ c ^ d, a, b, x, s, t);
	}
	function md5_ii(a, b, c, d, x, s, t)
	{
	  return md5_cmn(c ^ (b | (~d)), a, b, x, s, t);
	}

	/*
	 * Add integers, wrapping at 2^32. This uses 16-bit operations internally
	 * to work around bugs in some JS interpreters.
	 */
	function safe_add(x, y)
	{
	  var lsw = (x & 0xFFFF) + (y & 0xFFFF);
	  var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
	  return (msw << 16) | (lsw & 0xFFFF);
	}

	/*
	 * Bitwise rotate a 32-bit number to the left.
	 */
	function bit_rol(num, cnt)
	{
	  return (num << cnt) | (num >>> (32 - cnt));
	}

	return hex_md5(instring);
}